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https://issues.apache.org/jira/browse/HDFS-8786?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15159615#comment-15159615
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Jing Zhao commented on HDFS-8786:
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Thanks for working on this, Rakesh. Some quick comments:
# We can create replication task for an EC block only when we can make sure we
have all the internal blocks (the source nodes can be in
decommissioned/decommissioning state). Otherwise even if we have
decommissioned/decommissioning datanodes, we should still trigger an EC
reconstruction task.
# For changes in {{BlockInfoStriped}}, instead of directly mixing decommission
related logic inside, it will be better to add a sorting logic in BlockManager
just as what we do for contiguous blocks.
> Erasure coding: DataNode should transfer striped blocks before being
> decommissioned
> -----------------------------------------------------------------------------------
>
> Key: HDFS-8786
> URL: https://issues.apache.org/jira/browse/HDFS-8786
> Project: Hadoop HDFS
> Issue Type: Sub-task
> Reporter: Zhe Zhang
> Assignee: Rakesh R
> Attachments: HDFS-8786-001.patch, HDFS-8786-draft.patch
>
>
> Per [discussion |
> https://issues.apache.org/jira/browse/HDFS-8697?focusedCommentId=14609004&page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel#comment-14609004]
> under HDFS-8697, it's too expensive to reconstruct block groups for decomm
> purpose.
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